Duet Wifi, 5V

I'm about to connect 5V fans to my duet wifi board,
As I'm not sure if my fans really are brushless ones so I'm going to use flyback diodes.
I guess there're only required when for PWM fans and not needed for always on fans, or would the buck converter be require the protection ?

Another question about the buck converter, it's rated for 2A, would you discourage using it to also power a raspberry pi with its camera ?